CVE-2025-38396 (GCVE-0-2025-38396)

Vulnerability from cvelistv5 – Published: 2025-07-25 12:53 – Updated: 2025-11-03 17:37
VLAI?
Title
fs: export anon_inode_make_secure_inode() and fix secretmem LSM bypass
Summary
In the Linux kernel, the following vulnerability has been resolved: fs: export anon_inode_make_secure_inode() and fix secretmem LSM bypass Export anon_inode_make_secure_inode() to allow KVM guest_memfd to create anonymous inodes with proper security context. This replaces the current pattern of calling alloc_anon_inode() followed by inode_init_security_anon() for creating security context manually. This change also fixes a security regression in secretmem where the S_PRIVATE flag was not cleared after alloc_anon_inode(), causing LSM/SELinux checks to be bypassed for secretmem file descriptors. As guest_memfd currently resides in the KVM module, we need to export this symbol for use outside the core kernel. In the future, guest_memfd might be moved to core-mm, at which point the symbols no longer would have to be exported. When/if that happens is still unclear.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 2bfe15c5261212130f1a71f32a300bcf426443d4 , < 66d29d757c968d2bee9124816da5d718eb352959 (git)
Affected: 2bfe15c5261212130f1a71f32a300bcf426443d4 , < e3eed01347721cd7a8819568161c91d538fbf229 (git)
Affected: 2bfe15c5261212130f1a71f32a300bcf426443d4 , < f94c422157f3e43dd31990567b3e5d54b3e5b32b (git)
Affected: 2bfe15c5261212130f1a71f32a300bcf426443d4 , < 6ca45ea48530332a4ba09595767bd26d3232743b (git)
Affected: 2bfe15c5261212130f1a71f32a300bcf426443d4 , < cbe4134ea4bc493239786220bd69cb8a13493190 (git)
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    Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.1.146 , ≤ 6.1.* (semver)
Unaffected: 6.6.97 , ≤ 6.6.* (semver)
Unaffected: 6.12.37 , ≤ 6.12.* (semver)
Unaffected: 6.15.6 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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